John ashceoft



J. ASHCROPT.

GAS FURNAGE. No. 328,914. Patented Oct. 27, 1885.

I I (No Mdel.) F f 1%/ www o wmvfssfs Z y /fv VEA/'ron W By a Attorney l l ,K

N PETERS. Flwwmhqgnpher, wamingmn. D. C,

miren artnr trice.,

fens-i-URNeen.`

SPECJFJICATEON forming part of Letters Patent No. 328,914, dated October 27, 1885.

l i Application filed February 13, 1885. Serial No. 155,867. (No model.)

T0 @ZZ whom; it may concern.-

Be it known that I, JOHN Astronom, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain` new and useful Improvements in Devices for Burning Natural Gas in Glass and other Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings. l

My invention relates to improvements in devices for burning natural gas in glass and other furnaces.

The object of my inventionis to lead the gas and air into the combustion-chamber through separate ducts or tubes, so that combustion will not take place until said gases and air have entered the combustion-chamber.

Myinvcntion therefore consists in a separate air chamber or chambers and separate gas chamber or chambers, said air chamber or chambers being provided with numerous apertures, through which the air and tubes or ducts from the gas-chamber pass, whereby the vacuum caused by the entrance of the gas into the combustion-chamber will draw in with it the requisite amount of air to effect a complete combustion of the gases in the furnace or combustionchambei". l

My invention consists, further, in certain details of construction, which will be fully described, and pointed out in the claims.

Referring to the drawings, Figure lis a longitudinal sectional view of my device as applied to an ordinary boiler-furnace. Fig. 2 is a top or plan view of a portion of the airthe top of the air-chamber. .in the top of the air-chamber are somewhat chamber. Fig. 3 is an enlarged sectional view of a portion ofthe air-chamber with the gasduct and thimble.

A indicates the combustion-chamber, which may be of any form or size desired, the boiler A forming the top thereof, and the air chamber or chambers the bottom of the same.

B is the air-chamber, which, as above indicated, forms the bottom of the furnace, the upper surface of which is provided with numerous apertures, a, through which the gas and air is admitted to the combustion-chamber. The bottom or lower side of the airchamber is also provided with openings, in which are seated the tubes b, said tubes extending up to a level with the under side of The apertures a larger than the tubes b, so as to permit the air to pass freely into the combustion-chamber.

The chamber B is supplied with air through the pipe C, the outer end of said pipe being provided with a gate or slide, D, for controlling the amount of air admitted to the chamber B. f

E is the gas-chamber, and is supplied with gas by means of the pipe F, said pipe being provided with a valve or cock, G, for controlling the supply of gas. The upper side of the gaschamber' E is perforated, and provid ed with tubes c, which, when in position shown in Fig, l, pass up through the tubes b, and extend to near the upper edge of the air-chamber. The tubes c are somewhat smaller than the tubes b, so that an air-space, d, is left between them, so that when a small space, e, is left between the bottom of the air-chamber and the top of thegas-chamber the air will be drawn in and pass up between the tubes b and c, and thus prevent the gas-tube from becoming burned or overheated.

Apertures f f may be left in the front and rear walls of the furnace by or through which the air is admitted into the air-space d.

It will be seen that the air-chamber is directly underthe fire-chamber and receives its supply of air through the pipe O. The gas-' chamber being thus located beneath the airchamber is farthest from the iire, and when the air-space is left between the two chambers the gas-chamber is kept comparatively cool, and the temperature of the gas is kept as low as is required for mixing with the hot air entering the combustion-chamber. The pressure of gas entering the gas-chamber through the supply-pipe F forces it through the pipes c, said pipes being kept cool, or comparatively so, by the air-space d between the pipes b and c; and by having the pipes b a little shorter than the pipes c a vacuum is formed inthe openings a by the force of the inflowing gases, which draws the hot air from the air-chamber through the openings a also, and mingles it with the gas in such a manner as to effect a perfect and complete combustion.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-- IOO 1. The combination, in a furnace for burning gas, of an air chamber or chambers forming the bottom of the combustion chamber and having a series of openings leading to the said combustion-chamber, a gas-chamber located below said air-chamber and communieating with the combustion-chamber by a series of pipes leading up into said openings, and a series of pipes surrounding the gas-pipes and connecting with the external air, as set forth, whereby the gas-pipes are prevented from becoming overheated.

2. The combination of the air chamberA or chambers forming the bottom of the combustion-chambelyhaving apertures in the airehamber leading to the combustion-chamber, the gas-chamber, its supply-pipe and pipes extending into said apertures, and the tubesl surrounding said pipes and extending from air ducts or passages communicating with the open air, whereby a current of cold air may be established and m aintaiued around the gasinduetion pipes leading to the eombustonchamber, substantially as and for the purposes specied.

3. In devices for burning gas in furnaees,the perforated air chamber or chambers B, forming the bottom of the combustion-chamber, provided with the tubes b, which extend up to the openings in the top of the air chamber, in combination with the gas-chamber E, provided with the tubes c, which extend through and slightly above thetubes b, as set forth.

In testimony-whereoftfx my si gnature in presence of two witnesses.

JOHN ASHGROFT.

Witnesses:

SAMUEL P. BELL, A. G. lRrsBIE. 

